Optical coherence tomography versus visual evoked potentials in detecting subclinical visual impairment in multiple...

Area of Science:

• Ophthalmology
• Neuroscience
• Clinical Research

Background:

• Visual impairment is a common symptom in multiple sclerosis (MS), often present even with normal visual acuity.
• Sensitive tests like visual evoked potential (VEP) and optical coherence tomography (OCT) can detect subclinical visual pathway disturbances in MS.
• VEP assesses visual function, while OCT measures retinal nerve fiber layer (RNFL) thickness as a biomarker of axonal loss in MS.

Purpose of the Study:

• To identify visual impairment in MS patients who are asymptomatic.
• To compare the diagnostic utility of OCT and VEP in detecting subclinical visual disturbances.
• To evaluate the effectiveness of these methods in a cohort of clinically definite MS patients.

Main Methods:

• Studied 14 patients (28 eyes) with clinically definite MS, excluding those with a history of optic neuritis or other eye conditions.
• Conducted comprehensive ophthalmic examinations, including visual acuity and funduscopy.
• Measured retinal nerve fiber layer (RNFL) thickness using OCT and assessed visual pathway function with VEP.

Main Results:

• VEP abnormalities were detected in 11 out of 14 patients (78.57%).
• OCT revealed abnormalities in 5 out of 14 patients (35.71%).
• Three patients showed no abnormalities on either VEP or OCT.

Conclusions:

• VEP is more sensitive than OCT in detecting subclinical visual impairment in MS patients.
• VEP is the preferred method for diagnosing optic neuritis, both clinical and subclinical.
• OCT provides complementary information and is a valuable research tool for studying optic nerve disease in MS populations.